‘ 
460 Ethiops Mineral.— Saltpetre.—Gas from Coal Tar. 
MSS.; also many Mongol prints, a detailed catalogue of which 
will be published, to satisfy the curiosity of the public. 
V. An Oriental library, or a collection of Oriental MSS. 
relative to literature and information, which may furnish the 
learned with sufficient means to obtain a knowledge of the coun- 
tries of the East.— New ipl et Mag. ; 
XCV. Intelligence and Miscellaneous Articles. 
ETHIOPS MINERAL» 
Dx. TADDEI recommends the following process for the prepa- 
ration of ethiops mineral,:as being one which effects the com- 
bination immediately, and in a, more perfect manner than that 
generally employed. Put, one part, of sulphuret of potash. into 
a-mortar, with three or four parts of running mercury 3; triturate 
together, adding a little water by degrees, until the whole is re- 
duced to a homogeneous black paste; then add flowers of sul- 
phur in equal quantity to.the mercury employed, and mix the 
whole by a short trituration.. Then wash the w ‘hole ; and filter 
with repeated, portions of water, till all the alkaline sulphuret is 
removed, . Ethiops thus. repared is not of the black colour of 
that obtained by simple trituration, but it is a more perfect, com- 
bination. Dr. Taddei says, that the addition of a little sulphu- 
ret of potassa to,the mixture of sulphur and mercury does not 
do away with a long trituration, but that, proceeding as above, 
the substance is prepared instantiy.— Giornale di Fisica. 
NEW METHOD OF MANUFACTURING G SALTPETRE. 
M. Baffi, the celebrated chemist, a native of Pergola, has re- 
ceived from the Viceroy of Egypt a present of 100,000 crowns 
and the title of Bey,. for,having discovered a method of pro- 
ducing saltpetre without the assistance of fire, by mere heat of 
the sun. « Previous to this, every hundred weight of saltpetre 
cost the Viceroy ten crowns, which is reduced to one crown by 
~ the new method. The manufactory erected by M. Bafli_ in the 
great square of Memphis, has furnished within the last year 
3580 ewt. of saltpetre. An Egyptian cwt. is the same as the 
English. 
GAS FROM COAL ‘TAR. 
It has been found, by experiment, that the coal-tar liquor, 
which is sometimes considered as waste by those who make gas, 
if mixed with dry saw-dust, exhausted logwood, or fustic, to the 
consistence of paste, and allowed to remain till the water gs 
drainec 
